166720380 has 24 divisors (see below), whose sum is σ = 466817232. Its totient is φ = 44458752.

The previous prime is 166720363. The next prime is 166720427. The reversal of 166720380 is 83027661.

166720380 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389277 + ... + 1389396.

It is an arithmetic number, because the mean of its divisors is an integer number (19450718).

Almost surely, 2^166720380 is an apocalyptic number.

166720380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166720380 is an abundant number, since it is smaller than the sum of its proper divisors (300096852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166720380 is a wasteful number, since it uses less digits than its factorization.

166720380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778685 (or 2778683 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 166720380 is about 12912.0246282293. The cubic root of 166720380 is about 550.3803209723.

The spelling of 166720380 in words is "one hundred sixty-six million, seven hundred twenty thousand, three hundred eighty".